1898. _Sciurus negligens_ Nelson, Proc. Biol. Soc.
Washington, 12:147, June 3, type from Altamira, Tamaulipas.
1953. _Sciurus deppei negligens_, Hooper, Occas. Papers Mus.
Zool., Univ. Michigan, 544:4, March 25.
_Distribution in Tamaulipas._--Tropical forest in southern
part of state, north to Rancho Santa Rosa and Padilla.
In Tamaulipas this squirrel is called "ardilla chica" or "ardilla
barcina," and is abundant in areas where tall trees and dense brush
prevail. This species evidently does not have restricted periods of
activity, as does _S. aureogaster_, but is active throughout the day.
At El Carrizo a nest, nine to 10 inches in diameter and constructed of
leaves and small sticks, was in a thick tangle of branches 25 feet
above the ground. A male having testes 11 mm. long was in the nest.
Among 16 females collected in the months of February, May and June,
only two, taken in February, were lactating. A female from 70
kilometers south of Ciudad Victoria, had four placental scars, three on
the right side and one on the left, along with a resorbed embryo on the
right side; according to the collector "the scars appeared quite
recent, as evidenced by the fact that not all of the blood had been
resorbed yet."
The northernmost localities from which _S. d. negligens_ has been
reported are nine and a half miles southwest of Padilla in the east,
and Rancho Santa Rosa in the west.
Three males from the vicinity of Padilla weighed 309, 276, and 261
grams.
_Records of occurrence._--Specimens examined, 92: 9-1/2 mi.
SW Padilla, 800 ft., 3; Rancho Santa Rosa, 25 km. N, 13 km.
W Cd. Victoria, 260 m., 8; 3 mi. NE Guemes, 1; Sierra de
Tamaulipas, 10 mi. W, 2 mi. S Piedra, 1200 ft., 3; Ejido
Santa Isabel, 2 km. W Pan-American Highway, 2000 ft., 20; 70
km. (by highway) S Cd. Victoria and 6 mi. W Pan-American
Highway, 43; 2 km. W El Carrizo, 12; 8 km. W, 10 km. N El
Encino, 400 ft., 2.
Additional records: Victoria (Nelson, 1898:147); Santa Maria
(Goodwin, 1954:8); Rancho Viejo (_ibid._); Rancho del Cielo
(_ibid._); 3 mi. NW Acuna (Hooper, 1953:4); Pano Ayuctle
(_ibid._); Gomez Farias (Goodwin, 1954:8); Mesa de Llera, 10
mi. NE Zamorina (Hooper, 1953:4); Altamira (Nelson,
1898:147).
=Sciurus alleni= Nelson